A complex surface finite element quadrilateral mesh element in-plane direction adjusting method

By adjusting the minimum element in the element node array to be in the first position and adjusting the node order according to the cosine value of the included angle, the problem of chaotic in-plane orientation of complex-shaped finite element quadrilateral mesh elements is solved, achieving efficient and accurate orientation consistency adjustment and simplifying the subsequent strength verification work.

CN115512078BActive Publication Date: 2026-06-26XIAN AIRCRAFT DESIGN INST OF AVIATION IND OF CHINA
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Patents(China)
Current Assignee / Owner
XIAN AIRCRAFT DESIGN INST OF AVIATION IND OF CHINA
Filing Date
2022-10-12
Publication Date
2026-06-26

AI Technical Summary

Technical Problem

Existing technologies result in chaotic and disordered orientations within the complex-shaped finite element quadrilateral mesh cells, leading to a large workload and a high risk of errors in subsequent strength verification, while manual adjustments are inefficient.

Method used

By reading node data to form a preparation file, adjusting the smallest element in the element node array to be in the first position, and adjusting the node order according to the cosine value of the angle between the node connection and the X-axis, an output file conforming to the Nastran element filling format is generated, achieving consistency of the orientation within the element plane.

Benefits of technology

It enables efficient and accurate adjustment of the in-plane orientation of complex-shaped finite element quadrilateral mesh units, reducing the workload of subsequent strength verification and improving adjustment efficiency and accuracy.

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Abstract

A complex surface finite element quadrilateral mesh element in-plane direction adjustment method, comprising: reading the node data of the complex surface finite element model original file [1], corresponding the node number with the line number one by one, forming the preparation file [2]; reading the complex surface finite element model original file [1] line by line, finding out the invariant [3] corresponding to the first character of the line in the file: element number, attribute number, material number, local coordinate number; put the node 1 number, node 2 number, node 3 number, node 4 number into the element node array [4] in turn; combine the preparation file [2], put the X coordinate value of each node in the element node array [4] into the element node coordinate array [5] in turn; adjust the element in the element node array [4] corresponding to the minimum element in the element node coordinate array [5] to be in the first position; read each line of the complex surface finite element model original file [1] iteratively, combine the invariant [3] and the element node array [4] to generate the complex surface finite element model output file [6].
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